Boxing for drills.



J. A. HALLANDER.

BOXING FOR DRILLS.

APPLICATION man JULY 1. 1914.

1,131.39 Patented July 27,1915.

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JOHN A. HALLANDER, OF OTTUMWA, IOWA, ASSIGNOR T0 AMERICAN MINING- TOOL COMPANY, OF OTTUMWA, IOWA, A CORPORATION OF IOWA.

BOXING FOE DRILLS 1,11aa1e.

Specification of Letters Patent.

Patented July 2'7, 1915.

Application filed July 1, 1914. Serial No. 818,343.

To all whom it may concern:

Be it known that I, JOHN A. HALLANDER, a citizen of the United States, residing at Ottumwa, in the county of Wapello, State of Iowa, have invented certain new and useful Improvements in Boxings for Drills, of which the following is a specification, reference being had to the accompanying drawmgs.

My invention relates to drilling apparatus especially adapted for use in coal mines and analogous situations.

It has to do more particularly with devices, commonly termed boxings, applied to screw-threaded rods, commonly termed thread-bars, to which the drill is attached. Such boxings are threaded to fit the threads of the thread-bar and are provided with trunnions by which the boxing is pivotally supported by a post, or equivalent device.

The boxing also is usually provided with means for attaching thereto a suitable gearing for rotating the thread-bar and consequently moving it in one direction or the other to advance or withdraw the drill. As heretofore constructed, such boxings have usually been composed of two semicylindrical sections hinged together so that the boxing could be opened for the insertion or removal of the thread-bar, and suitable locking mechanism has been provided for securing the members of the boxing firmly together when closed.

My present invention has for its object to provide improved locking devices for boxings, of such construction that the members of the boxing may readily be locked or unlocked in situations such as commonly obtain in coal mines where the operator must rely upon the sense of feeling almost altogether.

A further object is to provide a locking device in which the strain of the lock will not be sustained by either of the trunnions which support the boxing; also to provide a lock which will allow the boxing to open freely and which will not be in the way of the thread-bar when the boxing is open, thus giving freer access to the thread-bar in placing it in position or in removing it from the boxing.

Another object is to simplify and improve the construction of locking devices of this character.

I accomplish these objects as illustrated in the drawings and as hereinafter described. That which I believe to be new is set forth in the claims.

In the accompanying drawings,-Figure 1 is ,an elevation of my improved boxing showing the members thereof closed and locked; Fig. 2 is a similar View, taken at right angles to the view shown in Fig. 1; Fig. 3 is a view showing an elevation of one of the members of the boxing, the other member being turned at an angle thereto; the lock being shown in its inoperative position; Fig. 1 is a plan view, partly broken away, showing the boxing closed and locked; and Fig. 5 is a detail, being a partial vertical section on line 55 of Fig. 1 and showing the locking members in locking position.

Referring to the drawings,6*7 indicate the two semi-cylindrical members of the boxing, which are internally screwthreaded to receive the usual thread-bar 8, as shown in Figs. 2 and 3. At one end, each of said boxing members is provided with a rectangular frame 9, which, when theboxing is closed, form a square coupling by which the usual gearing is attached to the boxing.

10-11 indicate trunnions fixedly secured at opposite sides of the member 7 of the boxing, preferably being cast integral therewith.

12 indicates a hinge-pin fitted in a boss 13 at the base of the trunnion 10, as shown in Fig. 1, and passing through suitable pivotholes in lugs 14-15 with which the member 6 is provided, as also shown in Fig. 1. Thus the two members 67 of the boxing are hinged together at one side so that the boxing may be closed upon the thread-bar 8 or may be opened for the removal or insertion of the thread-bar.

16 indicates an outwardly-projecting lug. preferably in the form of a segmental flange, provided on the member6 at its outer margin at a point which is opposite the base of the trunnion 11 when the members of the boxing are closed, as best shown in Figs. 2 and 5. The inner face of the member 7 is made concave at that point, as shown in Fig. 5, to receive the flange 16 so that when the boxing is closed said flange fits in such concave portion.

17 indicates a locking lever, which is pivoted at 18 upon the member 6 and is provided with a flange 19, the inner face of which is tapered so as to make said flange Said lug is set far enough from the trunnion may be freely opened and shut.

noted that the locking lever is carried by the 11 sothat when the boxing is closed it passes the flange 16 and is separated therefrom far enough to permit the flange 19 of the looking lever to fit between them, the fit being a tight one when the locking lever is turned to its final locking position.

The operation is as follows: When the locking lever 17 is in the position shown in Fig. 3, the members 67 are unlocked and It will be member 6 so that when said member is swung entirely open the member 7 is ex posed freely and an unobstructed passage is presented for the insertion or removal of the thread-bar. When the thread-bar has been put in place, the member 6 is swung over into the position shown in the remaining figures, and the lever 17 is turned to the position best shown in ig. 5, thereby moving the cam locking flange 19 between the locking lug 20 and the flange 16. The flange 19 being tapered or cam shaped, by forcing the lever 17 firmlytoward the member 7, or downward and inward in the illustration, the flange 19 is forced tightly between the lug 20 and the flange 16, thereby tightly locking the members 6 7 together. By this construction the locking strain is not sustained by the trunnion 11, but is carried by the lug 20. Furthermore, the movement of the locking lever 17 is a very simple one, and the operator can readily tell in the dark whether or not it is in looking position, and consequently the apparatus may be easily manipulated by the sense of touch.

The lug or flange 16 serves an important purpose in that it relieves the pivot 18 of the locking lever from all strain when such lever is operated to lock the members of the boxing together. As the flange 19 is forced between the lug 20 and the lug or flange 16, the members of the boxing are drawn. and held tightly together, and would remain locked even though the pivot 18 were ontirely removed.

That which I claim as my invention, and desire to secure by Letters Patent, is,

1. In a boxing for drills, the combination with two members hinged together, one of said members having trunnions and an inwardly-projecting lug, of a lug carried by the other member and adapted to pass said inwardly-projecting lug when the boxing is opened or closed, and a locking device carried by the latter member of the boxing and adapted to be moved between said lugs, for locking the members of the boxing together.

2. In a boxing for drills, the combination with two members hinged together, one of said members having trunnions and an inwardly-projecting lug, of a lug carried by the other member and adapted to pass said inwardly-projecting lug when the boxing is opened or closed, and a lever mounted on the latter member of the boxing and having a tapered member adapted to be moved between said lugs by the swinging of said lever, for locking the members of the boxing together.

3. In a boxing for drills, the combination with two members hinged together, one of said members having trunnions and an inwardly-projecting lug adjacent to one of said trunnions, of a segmental flange carried by the other member of the boxing, said flange being adapted to pass said lug when the boxing is opened or closed, and a lever mounted on the latter member of the boxing and having a tapered member adapted to be moved between said lug and said segmental flange by the swinging of said lever, for locking the members of the boxing together.

4. In a boxing for drills, the combination with two members hinged together, one of said members having trunnions and an inwardly-projecting lug adjacent to one of said trunnions, of a segmental flange carried by the other member of the boxing, said flange being adapted to pass said lug when the boxing is opened or closed, and a lever mounted on the latter member of the boxing and having a tapered flange adapted to pass between said segmental flange and said lug when the lever is swung to locking position.

JOHN A. HALLANDER.

Witnesses:

GEO. B. SIMMONS, OSCAR B. BENSON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0. 

